fix #447 and mobile display of programs buttons

assets/sass/_theme/sections/diplomas.sass

@@ -126,14 +126,16 @@ ul.diplomas
         @include media-breakpoint-down(md)
             gap: $spacing-3
             flex-direction: row
-            button, > a
+            button,
+            > a
                 width: columns(6)
+            button
+                min-width: unset
         @include media-breakpoint-up(md)
             flex-direction: column
             gap: $spacing-3
             --btn-min-width: #{columns(2)}
-            button, > a
-                width: pxToRem(200)
+            width: columns(2)
         @include media-breakpoint-down(desktop)
             margin-top: $spacing-3
     .container